Tycho: classify p2 metadata

Question

I am trying to create a categorized p2 repository using Tycho. There are three steps to this (compare the Eclipse Documentation ):

• Download Packages
• Trigger org.eclipse.equinox.p2.publisher.FeaturesAndBundlesPublisher
• Trigger org.eclipse.equinox.p2.publisher.CategoryPublisher

which I configured in the maven pom file. Steps 1 and 2 succeed, while step 3 fails:

Status ERROR: this code=0 publishing result null children=[Status ERROR: org.eclipse.equinox.p2.updatesite code=0 Error generating category xml action. org.eclipse.equinox.p2.core.ProvisionException: Error reading update site file:/<path>/category.xml.] 

Here is my pom.file

 <?xml version="1.0" encoding="UTF-8"?> <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001 XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd"> <modelVersion>4.0.0</modelVersion> <groupId>demo</groupId> <artifactId>simple-p2-repository</artifactId> <version>0.1.0-SNAPSHOT</version> <name>Simple p2 repository build</name> <packaging>pom</packaging> <properties> <tycho-version>0.18.0</tycho-version> </properties> <build> <plugins> <!-- Step 1 --> <plugin> <artifactId>maven-dependency-plugin</artifactId> <executions> <execution> <id>copy-bundles-for-publishing</id> <phase>process-resources</phase> <goals> <goal>copy</goal> </goals> <configuration> <artifactItems> <artifactItem> <groupId>org.apache.cxf</groupId> <artifactId>cxf-bundle</artifactId> <version>2.7.5</version> </artifactItem> </artifactItems> <outputDirectory>${project.basedir}/target/source/plugins</outputDirectory> </configuration> </execution> </executions> </plugin> <!-- Step 2 --> <plugin> <groupId>org.eclipse.tycho.extras</groupId> <artifactId>tycho-p2-extras-plugin</artifactId> <version>${tycho-version}</version> <executions> <execution> <phase>prepare-package</phase> <goals> <goal>publish-features-and-bundles</goal> </goals> </execution> </executions> <configuration> <compress>true</compress> <append>true</append> <publishArtifacts>true</publishArtifacts> </configuration> </plugin> <!-- Step3 --> <plugin> <groupId>org.eclipse.tycho</groupId> <artifactId>tycho-p2-plugin</artifactId> <version>${tycho-version}</version> <executions> <execution> <phase>package</phase> <goals> <goal>category-p2-metadata</goal> </goals> </execution> </executions> <configuration> <target>${basedir}/target/repository</target> <categoryDefinition>${basedir}/category.xml</categoryDefinition> </configuration> </plugin> </plugins> </build> </project> 

And my category.xml

 <?xml version="1.0" encoding="UTF-8"?> <site> <category-def name="all" label="Maven osgi-bundles"/> <iu> <category name="all"/> <query> <expression type="match">providedCapabilities.exists(p | p.namespace == 'osgi.bundle')</expression> </query> </iu> </site> 

If I manually followed the steps, the same error will occur. What am I missing?

Answer 1

Although it is theoretically possible to trigger low-level p2 actions through Tycho, I would not recommend this approach for the problem you are trying to solve.

The artifact is already available in the Maven repository, so you can easily add it to the target Tycho build platform via pomDependencies=consider , Then you can, for example, build a p2 repository with an artifact using the Tycho eclipse-repository packaging type.

You will need the following POM configuration ...

  ... <packaging>eclipse-repository</packaging> <dependencies> <dependency> <groupId>org.apache.cxf</groupId> <artifactId>cxf-bundle</artifactId> <version>2.7.5</version> </dependency> </dependencies> <build> <plugins> <plugin> <groupId>org.eclipse.tycho</groupId> <artifactId>target-platform-configuration</artifactId> <version>${tycho-version}</version> <configuration> <pomDependencies>consider</pomDependencies> </configuration> </plugin> </plugins> </build> 

... and category.xml, which explicitly lists the packages you want to include:

 <?xml version="1.0" encoding="UTF-8"?> <site> <bundle id="org.apache.cxf.bundle" version="0.0.0"> <category name="all"/> </bundle> <category-def name="all" label="Maven osgi-bundles"/> </site>